Ultrasonic welding fixing tool for steering column

Abstract

The utility model discloses an ultrasonic welding fixing tool for a steering column, which comprises a profiling block, a profiling groove matched with the outline of a steering column bracket is arranged on the profiling block, and a limiting block for limiting the steering column bracket to move outwards and a photoelectric detection piece for detecting whether the steering column bracket exists are arranged on one side of the profiling block; the clamping mechanism comprises two clamping modules which are symmetrically arranged on the two sides of the profiling block, and the two clamping modules are used for pressing or releasing the fabric on the steering column support. According to the utility model, the accurate positioning of the workpiece in the steering column welding process is realized, the consistency of the workpiece positioning is obviously improved, the stability and consistency of the welding quality are ensured, and the overall quality of the product is improved at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive interior part processing, and particularly relates to an ultrasonic welding and fixing tooling for a steering column. Background Art

[0002] The steering column is an important component connecting the steering wheel and the steering gear in an automobile. In modern automobile manufacturing, the steering column is usually composed of a bracket and a fabric cloth, and is connected by ultrasonic piercing welding. However, during the welding process, due to the soft texture of the fabric cloth, it is not easy to position, and it is prone to shift during the welding process, resulting in inaccurate welding positions and affecting product quality.

[0003] Currently, the traditional manual welding method has the following problems:

[0004] Difficult positioning: The fabric cloth is soft and not easy to fix, resulting in time-consuming and low-efficiency position adjustment before welding.

[0005] Welding deviation: Even after positioning, the fabric cloth is prone to running off during the welding process, resulting in inaccurate welding positions.

[0006] Quality problems: Due to the above reasons, the product is prone to a large number of defective products, with a high scrap rate, increasing production costs.

[0007] Therefore, there is an urgent need for an ultrasonic welding and fixing tooling for a steering column. Content of the Utility Model

[0008] In view of the deficiencies in the prior art, the utility model provides an ultrasonic welding and fixing tooling for a steering column.

[0009] The utility model discloses an ultrasonic welding and fixing tooling for a steering column, including:

[0010] A profiling block, on which a profiling groove adapted to the contour of the steering column bracket is provided, a limiting block for restricting the outward movement of the steering column bracket is provided on one side thereof, and a photoelectric detection member for detecting the presence or absence of the steering column bracket;

[0011] A clamping mechanism, which includes two clamping modules symmetrically arranged on both sides of the profiling block, and the two clamping modules are used to press or release the fabric cloth on the steering column bracket.

[0012] As a further improvement of the utility model, it further includes a substrate, and the profiling block and the clamping mechanism are installed on the substrate.

[0013] As a further improvement of the present utility model, the bottom of the profiling block is mounted on the substrate through a plurality of brackets; a plurality of the limiting blocks are arranged at the front edge of the profiling block corresponding to the profiling groove, and the plurality of limiting blocks can move in a direction towards or away from the profiling groove, so that the steering column bracket fits on the profiling block.

[0014] As a further improvement of the present utility model, a mounting portion extends horizontally outwards corresponding to each of the limiting blocks at the bottom of the profiling block, and the bottoms of the plurality of limiting blocks are mounted on the corresponding mounting portions;

[0015] A plurality of circular through holes are provided on the mounting portion, and a plurality of adjusting holes are provided on the limiting block corresponding to the plurality of circular through holes. The plurality of adjusting holes penetrate through the limiting block in the vertical direction, and the adjusting holes are long holes extending in the front-back direction of the profiling groove; an adjusting screw sequentially passes through the long hole and the circular through hole from top to bottom.

[0016] As a further improvement of the present utility model, the photoelectric detection member is a photoelectric sensor, and the photoelectric sensor is mounted at the front edge position of the profiling block corresponding to the profiling groove.

[0017] As a further improvement of the present utility model, the clamping module includes a mounting bottom plate, a mounting bracket, a connecting plate, a cylinder, a gear, a rack and a clamping jaw;

[0018] The mounting bottom plate is fixedly mounted on the substrate. On one side of the mounting bottom plate close to the profiling block, the mounting bracket is mounted in the vertical direction, and on the side far from the profiling block, the cylinder is mounted in the vertical direction. The connecting plate is mounted in the vertical direction between the mounting bracket and the cylinder, and the connecting plate can rise or fall in the vertical direction through the cylinder;

[0019] On one side of the connecting plate close to the mounting bracket, the rack is mounted in the vertical direction front and back. On one side of the mounting bracket close to the connecting plate, a linear guide rail is mounted in the vertical direction, and a linear bearing is slidably mounted on the linear guide rail; a sliding groove adapted to the sliding direction of the linear bearing is provided on one side of the connecting plate close to the mounting bracket; at the top of the mounting bracket, the gear meshing with the rack is mounted, and the clamping jaw is connected to the gear through the transmission shaft; the clamping jaw can be turned upwards and opened or pressed downwards against the fabric on the steering column bracket as the transmission shaft rotates.

[0020] As a further improvement of the present utility model, the clamping jaw includes a rotating portion, a connecting portion and a pressing portion. The rotating portion, the connecting portion and the pressing portion are sequentially detachably connected to form a "Z" - shaped structure. One end of the rotating portion far from the connecting portion is connected to the gear through the transmission shaft; the rotating portion can swing up and down as the transmission shaft rotates;

[0021] When the rotating part swings downward to the in-place position, the pressing part presses against the fabric on the steering column bracket; when the rotating part swings upward, the pressing part releases the fabric.

[0022] As a further improvement of the present utility model, a spring mounting post is installed on the front side of both the rotating part and the mounting bracket, and a spring is sleeved between the two spring mounting posts.

[0023] As a further improvement of the present utility model, the clamping mechanism further includes a three-position five-way mid-exhaust solenoid valve and a plurality of adjustable one-way valves;

[0024] The three-position five-way mid-exhaust solenoid valve includes an air source interface, an exhaust port A, an exhaust port B, a working interface A, and a working interface B; the working interface A is respectively connected to the cylinder air inlets of the two clamping modules through air pipes, and the working interface B is respectively connected to the cylinder air return ports of the two clamping modules through air pipes; the adjustable one-way valve is installed on each air pipe.

[0025] As a further improvement of the present utility model, a cylinder position detection module is configured on each cylinder;

[0026] Each cylinder position detection module includes a in-place detection piece and a return detection piece.

[0027] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0028] By setting the profiling block and the profiling groove adapted to the contour of the steering column bracket, and cooperating with the clamping mechanism, the present utility model realizes the precise positioning of the workpiece in the steering column welding process, significantly improves the consistency of workpiece positioning, ensures the stability and consistency of welding quality, and improves the overall quality of the product.

[0029] The present utility model can adopt the method of first manually pre-pressing and then performing equipment pressing and positioning, effectively improving the stability of assembly. Manual pre-pressing can initially fix the position of the workpiece, and equipment pressing and positioning can further ensure the stability and accuracy of the workpiece during the welding process, thereby reducing welding defects caused by workpiece movement.

[0030] The utility model significantly reduces the product quality problems caused by inaccurate positioning, thereby improving the qualified rate of products. The improvement of product quality helps to reduce customer complaints, enhance customer satisfaction, and further improve the market competitiveness of the enterprise; at the same time, by using automated equipment for workpiece clamping and positioning, the labor intensity of employees is effectively reduced. Employees only need to perform preliminary pre-pressing operations, and the subsequent clamping and positioning work is automatically completed by the equipment, which not only improves work efficiency but also reduces the fatigue and work injury risks of employees caused by repetitive labor, and improves the working environment of employees. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 FIG. 6 is a schematic structural diagram of a fixture for ultrasonic welding and fixing of a steering column disclosed in an embodiment of the utility model;

[0032] Figure 2 FIG. 10 is a schematic structural diagram of another angle of a fixture for ultrasonic welding and fixing of a steering column disclosed in an embodiment of the utility model;

[0033] Figure 3 FIG. 14 is a front view of the structure of a fixture for ultrasonic welding and fixing of a steering column disclosed in an embodiment of the utility model;

[0034] Figure 4 FIG. 18 is a top view of the structure of a fixture for ultrasonic welding and fixing of a steering column disclosed in an embodiment of the utility model;

[0035] Figure 5 FIG. 22 is a schematic installation diagram of a profiling block of a fixture for ultrasonic welding and fixing of a steering column disclosed in an embodiment of the utility model;

[0036] Figure 6 FIG. 26 is a schematic installation diagram of a clamping mechanism of a fixture for ultrasonic welding and fixing of a steering column disclosed in an embodiment of the utility model;

[0037] Figure 7 FIG. 30 is a schematic structural diagram of a clamping mechanism of a fixture for ultrasonic welding and fixing of a steering column disclosed in an embodiment of the utility model;

[0038] Figure 8 FIG. 34 is a schematic structural diagram of another angle of a clamping mechanism of a fixture for ultrasonic welding and fixing of a steering column disclosed in an embodiment of the utility model;

[0039] Figure 9 FIG. 38 is a schematic structural diagram of another angle of a clamping mechanism of a fixture for ultrasonic welding and fixing of a steering column disclosed in an embodiment of the utility model;

[0040] Figure 10 FIG. 42 is a schematic installation diagram of a gear of a clamping mechanism of a fixture for ultrasonic welding and fixing of a steering column disclosed in an embodiment of the utility model;

[0041] Figure 11 Schematic diagram of the cooperation between the gear and the transmission shaft of the clamping mechanism for the ultrasonic welding and fixing tooling of the steering column disclosed in an embodiment of the present utility model;

[0042] Figure 12 Schematic diagram of the air circuit connection for the ultrasonic welding and fixing tooling of the steering column disclosed in an embodiment of the present utility model.

[0043] In the figure:

[0044] 1. Profiling block; 1-1. Profiling block main body; 1-11. Installation part; 1-2. Profiling groove; 1-3. Limiting block; 1-4. Bracket; 2. Clamping mechanism; 2-1. Installation bottom plate; 2-2. Installation bracket; 2-21. U-shaped groove; 2-3. Connecting plate; 2-31. U-shaped clamping part; 2-32. Chute; 2-4. Cylinder; 2-41. Return position detection part; 2-42. In-place detection part; 2-5. Transmission shaft; 2-6. Claw; 2-61. Rotating part; 2-62. Connecting part; 2-63. Pressing part; 2-7. Rack; 2-8. Linear guide rail; 2-9. Linear bearing; 2-10. Gear; 3. Substrate; 4. Photoelectric sensor; 5. Spring installation column; 6. Spring; 7. Three-position five-way mid-drain solenoid valve; 8. Adjustable one-way valve. Detailed implementation manners

[0045] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0046] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0047] In the description of the present utility model, it should also be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0048] The following further describes the present utility model in detail with reference to the accompanying drawings:

[0049] As Figures 1-4 shown, a fixture for ultrasonic welding and fixing of a steering column according to the present utility model includes a profiling block 1 and a clamping mechanism 2. Among them, a profiling groove 1-2 matching the contour of the steering column bracket is provided on the profiling block 1, a limiting block 1-3 for restricting the outward movement of the steering column bracket is provided on one side thereof, and a photoelectric detection component for detecting the presence or absence of the steering column bracket; the clamping mechanism 2 includes two clamping modules symmetrically arranged on both sides of the profiling block 1, and the two clamping modules are used to press or release the fabric on the steering column bracket.

[0050] In this embodiment, by providing the profiling block 1, the profiling groove 1-2 matching the contour of the steering column bracket, and cooperating with the clamping mechanism 2, precise positioning of the workpiece in the steering column welding process is achieved, significantly improving the consistency of workpiece positioning. While ensuring the stability and consistency of the welding quality, the overall quality of the product is improved; the method of first manually pre-pressing and then using the equipment to press and position can effectively improve the stability of assembly. Manual pre-pressing can initially fix the position of the workpiece, and equipment pressing and positioning can further ensure the stability and accuracy of the workpiece during the welding process, thereby reducing welding defects caused by workpiece movement; at the same time, it significantly reduces product quality problems caused by inaccurate positioning, thereby improving the qualification rate of the product, enhancing customer satisfaction, and further enhancing the market competitiveness of the enterprise; by using an automated device to press and position the workpiece, the labor intensity of employees is effectively reduced, the fatigue and work injury risks caused by employees' repetitive labor are reduced, and the working environment of employees is improved.

[0051] Specifically:

[0052] As Figures 1-4 shown, in the above embodiment, preferably, a substrate 3 is further included, and the substrate 3 is used to carry the profiling block 1 and the clamping mechanism 2, so that the profiling block 1 and the clamping mechanism 2 are installed on the same horizontal plane.

[0053] As Figure 5As shown, in the above embodiment, preferably, the profiling block 1 includes a profiling block body 1-1 having a rectangular body structure. An inward concave U-shaped profiling groove 1-2 that penetrates through the front and rear is formed at the top of the profiling block body 1-1. The profiling groove 1-2 profiles the contour of the steering column bracket, and can quickly position the steering column bracket. A plurality of limiting blocks 1-3 are arranged at the front edge of the profiling block body 1-1 corresponding to the profiling groove 1-2. The plurality of limiting blocks 1-3 are arranged at intervals along the length direction of the profiling block body 1-1, and the plurality of limiting blocks 1-3 can move in a direction towards or away from the profiling groove 1-2, so that the steering column bracket fits on the profiling block body 1-1. The number of the limiting blocks 1-3 in this embodiment is preferably 2.

[0054] In the above embodiment, preferably, a plurality of brackets 1-4 are installed at intervals along the length direction of the bottom of the profiling block 1. The plurality of brackets 1-4 are all arranged in the vertical direction, and their bottoms are fixedly installed on the substrate 3. The bottom plate of the profiling block 1 extends a certain distance outward in the horizontal direction corresponding to each limiting block 1-3 to form an installation portion 1-11, and the installation portion 1-11 is used for installing the limiting block 1-3. In order to enable the plurality of limiting blocks 1-3 to move in a direction towards or away from the profiling groove 1-2, a plurality of circular through holes are provided on the installation portion 1-11 in this embodiment. The limiting block 1-3 is provided with a plurality of adjustment holes corresponding to the plurality of circular through holes. The plurality of adjustment holes penetrate through the limiting block in the vertical direction, and the adjustment holes are long holes extending in the front-rear direction of the profiling groove 1-2. The adjustment screw sequentially passes through the long hole and the circular through hole from top to bottom. When it is necessary to adjust the limiting block 1-3, only need to loosen the adjustment screw, and the limiting block 1-3 can cooperate with the adjustment screw through its long hole and move in a direction towards or away from the profiling groove 1-2 to ensure that the steering column bracket fits better on the profiling block 1.

[0055] In the above embodiment, preferably, the photoelectric detection member is a photoelectric sensor 4. The photoelectric sensor 4 is installed at the front edge position of the profiling block 1 corresponding to the profiling groove 1-2. In this embodiment, the photoelectric sensor 4 is installed in the middle of the two limiting blocks 1-3. The setting of the photoelectric sensor 4 is mainly used to detect whether a steering column bracket is placed in the profiling groove 1-2 to prevent missing parts.

[0056] In the above embodiment, preferably, the profiling block 1 is made of copper material, which is convenient for heat dissipation after ultrasonic welding and the solder joints are formed better. The substrate 3 and the brackets 1-4 are both made of aluminum material, which has the advantages of light weight, high strength and easy processing.

[0057] As Figures 6-11As shown, in the above embodiment, preferably, the clamping module includes a mounting base plate 2-1, a mounting bracket 2-2, a connecting plate 2-3, a cylinder 2-4, a transmission shaft 2-5, a jaw 2-6, a rack 2-7, a linear guide rail 2-8, a linear bearing 2-9 and a gear 2-10; wherein, the mounting base plate 2-1 is detachably mounted on the substrate 3 by bolts. On one side of the top of the mounting base plate 2-1 close to the profiling block 1, a mounting bracket 2-2 is mounted vertically. On one side of the top of the mounting base plate 2-1 far from the profiling block 1, a cylinder 2-4 is mounted vertically, and the extending direction of the piston rod of the cylinder 2-4 extends vertically upward. The connecting plate 2-3 is arranged vertically between the mounting bracket 2-2 and the cylinder 2-4, and a U-shaped clamping portion 2-31 protrudes horizontally outward in the middle of the side of the connecting plate 2-3 close to the cylinder 2-4. Annular protrusions are respectively mounted on the upper and lower parts corresponding to the U-shaped clamping portion 2-31 at the end of the piston rod of the cylinder 2-4. The connecting plate 2-3 is clamped between the upper and lower annular protrusions through the U-shaped clamping portion 2-31. When the piston rod of the cylinder 2-4 makes a telescopic movement, the connecting plate 2-3 can be driven to move up and down vertically; on the side of the connecting plate 2-3 close to the mounting bracket 2-2, a rack 2-7 and a chute 2-32 are mounted vertically, and the rack 2-7 and the chute 2-32 are arranged front and back on the connecting plate 2-3.

[0058] In the above embodiment, preferably, on the side of the mounting bracket 2-2 close to the connecting plate 2-3, a linear guide rail 2-8 matched with the chute 2-32 is mounted vertically. A linear bearing 2-9 is slidably mounted on the linear guide rail 2-8, and the width of the linear bearing 2-9 is adapted to the width of the chute 2-32; so that the linear bearing 2-9 can slide up and down along the laying direction of the chute 2-32 and the linear guide rail 2-8; on one side of the top of the mounting bracket 2-2, a U-shaped groove 2-21 is recessed vertically inward. A gear seat is arranged on the side of the U-shaped groove 2-21 close to the rack 2-7, and a gear 2-10 is mounted in the gear seat. A transmission shaft 2-5 passes through the U-shaped groove 2-21, and after passing through the U-shaped groove 2-21, the transmission shaft 2-5 is connected to the gear 2-10, and the gear 2-10 is simultaneously meshed with the rack 2-7; one end of the jaw 2-6 is placed in the U-shaped groove 2-21 and is rotatably connected to the transmission shaft 2-5, so that the jaw 2-6 can swing up and down in the U-shaped groove 2-21 as the transmission shaft 2-5 rotates, and then fold upward to open or press downward on the fabric on the steering column bracket.

[0059] In the above embodiment, preferably, the jaw 2-6 includes a rotating part 2-61, a connecting part 2-62 and a pressing part 2-63. Among them, the rotating part 2-61, the connecting part 2-62 and the pressing part 2-63 are detachably connected in sequence to form a "Z" - shaped structure. One end of the rotating part 2-61 away from the connecting part 2-62 is placed in the U - shaped groove 2-21 and is connected to the gear 2-10 through the transmission shaft 2-5. The rotating part 2-61 can swing up and down in the U - shaped groove 2-21 along with the rotation of the transmission shaft 2-5. When the rotating part 2-61 swings down in place, the pressing part 2-63 presses against the fabric on the steering column bracket. When the rotating part 2-61 swings up, the pressing part 2-63 releases the fabric. In this embodiment, the pressing part 2-63 is in the shape of a horizontally placed L - shape to better complete the fixing work of the fabric on the steering column bracket.

[0060] In the above embodiment, preferably, when the jaw 2-6 presses down in place, at this time, the connecting part 2-62 of the jaw 2-6 fits against the side wall of the U - shaped profiling groove 1-2.

[0061] In the above embodiment, preferably, in actual production, when there is no pre - pressing action on the workpiece and the pressing is directly driven by the air cylinder 2-4, since the movement of the jaw 2-6 is large and relatively fast, it is very easy to cause the offset of the fabric during the clamping process, resulting in welding defects. Therefore, in this embodiment, a spring installation post 5 is installed on the front side of both the rotating part 2-61 and the mounting bracket 2-2. A spring 6 for providing prestress is sleeved between the two spring installation posts 5. When the jaw 2-6 is manually lowered to pre - press the workpiece, under the action of the spring 6, a certain pre - pressing force can be achieved to prevent the deviation of the workpiece position.

[0062] As Figure 12 shown, in the above embodiment, preferably, the clamping mechanism further includes a three - position five - way mid - exhaust solenoid valve 7 and 4 adjustable check valves 8. Among them, the three - position five - way mid - exhaust solenoid valve 7 includes an air source interface, an exhaust port A, an exhaust port B, a working interface A, and a working interface B. The air source interface is used to connect to an external air source. The exhaust port A and the exhaust port B are used to discharge gas. The working interface A is respectively connected to the air inlets of the air cylinders 2-4 of the two clamping modules through air pipes. The working interface B is respectively connected to the air return ports of the air cylinders 2-4 of the two clamping modules through air pipes. And an adjustable check valve 8 is arranged on each air pipe to control the extension or retraction speed of the piston rods of the two air cylinders 2-4, so as to better protect the tooling and improve its stability.

[0063] During actual use, when an employee installs a workpiece, the three-position five-way center-exhaust solenoid valve 7 is in the middle position. Since it is center-exhaust, the cylinders 2-4 on both sides of the profiling block 1 are in a pressure-relief state. At this time, the employee can easily manually lower the clamping jaws 2-6 to pre-press the fabric on the surface of the steering column bracket located in the profiling groove 1-2; when the steering column bracket and the fabric are installed in place, the employee starts the equipment. At this time, the coil 14 of the three-position five-way center-exhaust solenoid valve 7 is energized, and the two cylinders 2-4 are both in the extended state. At this time, the clamping jaws 2-6 clamp the fabric on the surface of the steering column bracket to ensure that it is in a pneumatic pressing state during the entire welding process; when the fabric welding is completed, the coil 14 of the three-position five-way center-exhaust solenoid valve 7 is de-energized, and the coil 12 is energized. At this time, the two cylinders 2-4 start to retract. At this time, the clamping jaws 2-6 release the fabric on the surface of the steering column bracket; after the clamping jaws 2-6 are folded up in place, the coil 12 of the three-position five-way center-exhaust solenoid valve 7 is de-energized. At this time, the three-position five-way center-exhaust solenoid valve 7 is in the middle position, and the employee manually removes the steering column with the fabric that has completed welding. By repeating the above steps, the next round of production can be carried out.

[0064] In the above embodiment, preferably, each cylinder 2-4 is configured with a cylinder position detection module; each cylinder position detection module includes a in-place detection component 2-42 and a return detection component 2-41. The in-place detection component 2-42 and the return detection component 2-41 are both cylinder position detection magnetic switches, which are used to feedback whether the cylinder 2-4 is in the extended position or the retracted position, so as to monitor whether the clamping jaws 2-6 are in the clamping position or the open position.

[0065] In the above embodiment, preferably, it further includes a control module. The in-place detection component 2-42, the return detection component 2-41 of each cylinder, the three-position five-way center-exhaust solenoid valve 7, and the 4 adjustable one-way valves 8 are all electrically connected to the control module. The control module in this embodiment includes but is not limited to a PLC.

[0066] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A tool for ultrasonic welding of steering columns, characterized in that: include: A profiling block, on which a profiling groove matching the outline of the steering column bracket is provided, and one side of which is provided with a limit block for limiting the outward movement of the steering column bracket, and a photoelectric detection member for detecting the presence or absence of the steering column bracket; The clamping mechanism comprises two clamping modules symmetrically arranged on both sides of the profiling block, and the two clamping modules are used to press or release the fabric on the steering column bracket.

2. The ultrasonic welding fixture for steering column according to claim 1, characterized in that: It also includes a base plate, on which the contour block and the clamping mechanism are mounted.

3. The ultrasonic welding fixture for steering column according to claim 2, characterized in that: The bottom of the profiling block is installed on the base plate through a plurality of brackets; the profiling block is provided with a plurality of limit blocks corresponding to the front edge of the profiling groove, and the plurality of limit blocks can move in a direction toward or away from the profiling groove so that the steering column bracket fits on the profiling block.

4. The ultrasonic welding fixture for steering column according to claim 3, characterized in that: The bottom of the profiling block corresponds to each of the limit blocks and extends outward horizontally to form a mounting portion, and the bottoms of the plurality of limit blocks are mounted on the corresponding mounting portions; The mounting portion is provided with a plurality of circular through holes, and the limit block is provided with a plurality of adjustment holes corresponding to the plurality of circular through holes. The plurality of adjustment holes all penetrate the limit block in a vertical direction, and the adjustment holes are long holes extending in the front-to-back direction of the contoured groove; the adjusting screw passes through the long holes and the circular through holes in sequence from top to bottom.

5. The ultrasonic welding fixture for steering column according to claim 1, characterized in that: The photoelectric detection element is a photoelectric sensor, and the photoelectric sensor is installed at the front position of the profiling block corresponding to the profiling groove.

6. The ultrasonic welding fixture for steering column according to claim 2, characterized in that: The clamping module includes a mounting base plate, a mounting bracket, a connecting plate, a cylinder, a gear, a rack and a clamping claw; The mounting base plate is fixedly mounted on the base plate, the mounting bracket is mounted on the top of the mounting base plate near the profiling block in the vertical direction, the cylinder is mounted on the top of the mounting base plate away from the profiling block in the vertical direction, the connecting plate is mounted between the mounting bracket and the cylinder in the vertical direction, and the connecting plate can be raised or lowered in the vertical direction by the cylinder; The rack is installed in the vertical direction on one side of the connecting plate close to the mounting bracket, and a linear guide is installed in the vertical direction on one side of the mounting bracket close to the connecting plate, and a linear bearing is slidably installed on the linear guide; a slide groove adapted to the sliding direction of the linear bearing is provided on one side of the connecting plate close to the mounting bracket; the gear meshing with the rack is installed on the top of the mounting bracket, and the clamp is connected to the gear through the transmission shaft; the clamp can be folded upward and opened or pressed downward against the fabric cloth on the steering column bracket as the transmission shaft rotates.

7. The ultrasonic welding fixture for steering column according to claim 6, characterized in that: The clamping claw comprises a rotating part, a connecting part and a pressing part, wherein the rotating part, the connecting part and the pressing part are detachably connected in sequence to form a "Z"-shaped structure, and an end of the rotating part away from the connecting part is connected to the gear through the transmission shaft; the rotating part can swing up and down with the rotation of the transmission shaft; When the rotating part swings downward to a certain position, the pressing part presses against the fabric on the steering column bracket; when the rotating part swings upward, the pressing part releases the fabric.

8. The ultrasonic welding fixture for steering column according to claim 7, characterized in that: A spring mounting column is installed on the front side of the rotating part and the front side of the mounting bracket, and a spring is sleeved between the two spring mounting columns.

9. The ultrasonic welding fixture for steering column according to claim 6, characterized in that: The clamping mechanism also includes a three-position five-way center-drain solenoid valve and a plurality of adjustable one-way valves; The three-position five-way center-drain solenoid valve includes an air source interface, an exhaust port A, an exhaust port B, a working interface A, and a working interface B; the working interface A is connected to the cylinder air inlets of the two clamping modules through air pipes, and the working interface B is connected to the cylinder air return ports of the two clamping modules through air pipes; the adjustable one-way valve is installed on each of the air pipes.

10. The ultrasonic welding fixture for steering column according to claim 9, characterized in that: Each of the cylinders is equipped with a cylinder position detection module; Each of the cylinder position detection modules includes an in-position detection component and a return detection component.

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